Bio-efficacy of selected plant extracts against yellow stem borer, Scirpophaga incertulas Walker on Rice in Assam

Field efficacy of petroleum benzene and methanol extracts of four plant viz., Zanthoxylum armatum, Tagetes erecta, Allium sativum and Lantana camara were investigated against yellow stem borer, Scirpophaga incertulas on farmers farm in Dargakona of Cachar district, Assam. Among the two solvents, petroleum benzene extract proved to be the best against the pest species. Petroleum benzene extract of Allium sativum was found to be the most effective treatments (1.86% DH & 0.79% WH) among all the treatments during both the vegetative and reproductive stages of the crop plant while the least (3.9% DH & 2.0% WH) was afforded by methanol extract of Zanthoxylum armatum. The field trial revealed the significant performance of all the treatments on all the days after treatments over control except on 1DAT during second spray with methanol extract.